import { isBoolean, isFunction } from '@/utils/is'
import { buildUUID } from '@/utils/uuid'
import { useTimeoutFn } from '@vueuse/core'
import { cloneDeep, get, merge } from 'lodash-es'
import { ComputedRef, Ref, computed, onMounted, reactive, ref, unref, watch, watchEffect } from 'vue'
import { FETCH_SETTING, PAGE_SIZE, ROW_KEY } from '../const'
import type { PaginationProps } from '../types/pagination'
import type { BasicTableProps, FetchParams, SorterResult } from '../types/table'

interface ActionType {
  getPaginationInfo: ComputedRef<boolean | PaginationProps>
  setPagination: (info: Partial<PaginationProps>) => void
  setLoading: (loading: boolean) => void
  getFieldsValue: () => Recordable
  clearSelectedRowKeys: () => void
  tableData: Ref<Recordable[]>
}

interface SearchState {
  sortInfo: Recordable
  filterInfo: Record<string, string[]>
}
export function useDataSource(
  propsRef: ComputedRef<BasicTableProps>,
  { getPaginationInfo, setPagination, setLoading, getFieldsValue, clearSelectedRowKeys, tableData }: ActionType,
  emit: EmitType
) {
  const searchState = reactive<SearchState>({
    sortInfo: {},
    filterInfo: {}
  })
  const dataSourceRef = ref<Recordable[]>([])
  const rawDataSourceRef = ref<Recordable>({})

  watchEffect(() => {
    tableData.value = unref(dataSourceRef)
  })

  watch(
    () => unref(propsRef).dataSource,
    () => {
      const { dataSource, api } = unref(propsRef)
      !api && dataSource && (dataSourceRef.value = dataSource)
    },
    {
      immediate: true
    }
  )

  function handleTableChange(
    pagination: PaginationProps,
    filters: Partial<Recordable<string[]>>,
    sorter: SorterResult
  ) {
    const { clearSelectOnPageChange, sortFn, filterFn } = unref(propsRef)
    if (clearSelectOnPageChange) {
      clearSelectedRowKeys()
    }
    setPagination(pagination)

    const params: Recordable = {}
    if (sorter && isFunction(sortFn)) {
      const sortInfo = sortFn(sorter)
      searchState.sortInfo = sortInfo
      params.sortInfo = sortInfo
    }

    if (filters && isFunction(filterFn)) {
      const filterInfo = filterFn(filters)
      searchState.filterInfo = filterInfo
      params.filterInfo = filterInfo
    }
    fetch(params)
  }

  function setTableKey(items: any[]) {
    if (!items || !Array.isArray(items)) return
    items.forEach((item) => {
      if (!item[ROW_KEY]) {
        item[ROW_KEY] = buildUUID()
      }
      if (item.children && item.children.length) {
        setTableKey(item.children)
      }
    })
  }

  const getAutoCreateKey = computed(() => {
    return unref(propsRef).autoCreateKey && !unref(propsRef).rowKey
  })

  const getRowKey = computed(() => {
    const { rowKey } = unref(propsRef)
    return unref(getAutoCreateKey) ? ROW_KEY : rowKey
  })

  const getDataSourceRef = computed(() => {
    const dataSource = unref(dataSourceRef)
    if (!dataSource || dataSource.length === 0) {
      return unref(dataSourceRef)
    }
    if (unref(getAutoCreateKey)) {
      const firstItem = dataSource[0]
      const lastItem = dataSource[dataSource.length - 1]

      if (firstItem && lastItem) {
        if (!firstItem[ROW_KEY] || !lastItem[ROW_KEY]) {
          const data = cloneDeep(unref(dataSourceRef))
          data.forEach((item) => {
            if (!item[ROW_KEY]) {
              item[ROW_KEY] = buildUUID()
            }
            if (item.children && item.children.length) {
              setTableKey(item.children)
            }
          })
          dataSourceRef.value = data
        }
      }
    }

    return unref(dataSourceRef)
  })

  async function updateTableData(index: number, key: string, value: any) {
    const record = dataSourceRef.value[index]
    if (record) {
      dataSourceRef.value[index][key] = value
    }
    return dataSourceRef.value[index]
  }

  function updateTableDataRecord(rowKey: string | number, record: Recordable): Recordable | undefined {
    const row = findTableDataRecord(rowKey)

    if (row) {
      for (const field in row) {
        if (Reflect.has(record, field)) row[field] = record[field]
      }
      return row
    }
  }

  function deleteTableDataRecord(rowKey: string | number | string[] | number[]) {
    if (!dataSourceRef.value || dataSourceRef.value.length == 0) return
    const rowKeyName = unref(getRowKey)
    if (!rowKeyName) return
    const rowKeys = !Array.isArray(rowKey) ? [rowKey] : rowKey
    for (const key of rowKeys) {
      let index: number | undefined = dataSourceRef.value.findIndex((row) => {
        let targetKeyName: string
        if (typeof rowKeyName === 'function') {
          targetKeyName = rowKeyName(row)
        } else {
          targetKeyName = rowKeyName as string
        }
        return row[targetKeyName] === key
      })
      if (index >= 0) {
        dataSourceRef.value.splice(index, 1)
      }
      index = unref(propsRef).dataSource?.findIndex((row) => {
        let targetKeyName: string
        if (typeof rowKeyName === 'function') {
          targetKeyName = rowKeyName(row)
        } else {
          targetKeyName = rowKeyName as string
        }
        return row[targetKeyName] === key
      })
      if (typeof index !== 'undefined' && index !== -1) unref(propsRef).dataSource?.splice(index, 1)
    }
    setPagination({
      total: unref(propsRef).dataSource?.length
    })
  }

  function insertTableDataRecord(record: Recordable, index: number): Recordable | undefined {
    // if (!dataSourceRef.value || dataSourceRef.value.length == 0) return;
    index = index ?? dataSourceRef.value?.length
    unref(dataSourceRef).splice(index, 0, record)
    return unref(dataSourceRef)
  }

  function findTableDataRecord(rowKey: string | number) {
    if (!dataSourceRef.value || dataSourceRef.value.length == 0) return

    const rowKeyName = unref(getRowKey)
    if (!rowKeyName) return

    const { childrenColumnName = 'children' } = unref(propsRef)

    const findRow = (array: any[]) => {
      let ret
      array.some(function iter(r) {
        if (typeof rowKeyName === 'function') {
          if ((rowKeyName(r) as string) === rowKey) {
            ret = r
            return true
          }
        } else {
          if (Reflect.has(r, rowKeyName) && r[rowKeyName] === rowKey) {
            ret = r
            return true
          }
        }
        return r[childrenColumnName] && r[childrenColumnName].some(iter)
      })
      return ret
    }

    // const row = dataSourceRef.value.find(r => {
    //   if (typeof rowKeyName === 'function') {
    //     return (rowKeyName(r) as string) === rowKey
    //   } else {
    //     return Reflect.has(r, rowKeyName) && r[rowKeyName] === rowKey
    //   }
    // })
    return findRow(dataSourceRef.value)
  }

  async function fetch(opt?: FetchParams) {
    const { api, searchInfo, defSort, fetchSetting, beforeFetch, afterFetch, useSearchForm, pagination } =
      unref(propsRef)
    if (!api || !isFunction(api)) return
    try {
      setLoading(true)
      const { pageField, sizeField, listField, totalField } = Object.assign({}, FETCH_SETTING, fetchSetting)
      let pageParams: Recordable = {}

      const { current = 1, pageSize = PAGE_SIZE } = unref(getPaginationInfo) as PaginationProps

      if ((isBoolean(pagination) && !pagination) || isBoolean(getPaginationInfo)) {
        pageParams = {}
      } else {
        pageParams[pageField] = (opt && opt.page) || current
        pageParams[sizeField] = pageSize
      }

      const { sortInfo = {}, filterInfo } = searchState

      let params: Recordable = merge(
        pageParams,
        useSearchForm ? getFieldsValue() : {},
        searchInfo,
        opt?.searchInfo ?? {},
        defSort,
        sortInfo,
        filterInfo,
        opt?.sortInfo ?? {},
        opt?.filterInfo ?? {}
      )
      if (beforeFetch && isFunction(beforeFetch)) {
        params = (await beforeFetch(params)) || params
      }

      const { data } = await api(params)
      rawDataSourceRef.value = data

      const isArrayResult = Array.isArray(data)

      let resultItems: Recordable[] = isArrayResult ? data : get(data, listField)
      const resultTotal: number = isArrayResult ? data.length : get(data, totalField)

      // 假如数据变少，导致总页数变少并小于当前选中页码，通过getPaginationRef获取到的页码是不正确的，需获取正确的页码再次执行
      if (resultTotal) {
        const currentTotalPage = Math.ceil(resultTotal / pageSize)
        if (current > currentTotalPage) {
          setPagination({
            current: currentTotalPage
          })
          return await fetch(opt)
        }
      }

      if (afterFetch && isFunction(afterFetch)) {
        resultItems = (await afterFetch(resultItems)) || resultItems
      }
      dataSourceRef.value = resultItems
      setPagination({
        total: resultTotal || 0
      })
      if (opt && opt.page) {
        setPagination({
          current: opt.page || 1
        })
      }
      emit('fetch-success', {
        items: unref(resultItems),
        total: resultTotal
      })
      return resultItems
    } catch (error) {
      emit('fetch-error', error)
      dataSourceRef.value = []
      setPagination({
        total: 0
      })
    } finally {
      setLoading(false)
    }
  }

  function setTableData<T = Recordable>(values: T[]) {
    dataSourceRef.value = values as Recordable<any>[]
  }

  function getDataSource<T = Recordable>() {
    return getDataSourceRef.value as T[]
  }

  function getRawDataSource<T = Recordable>() {
    return rawDataSourceRef.value as T
  }

  async function reload(opt?: FetchParams) {
    return await fetch(opt)
  }

  onMounted(() => {
    useTimeoutFn(() => {
      unref(propsRef).immediate && fetch()
    }, 16)
  })

  return {
    getDataSourceRef,
    getDataSource,
    getRawDataSource,
    getRowKey,
    setTableData,
    getAutoCreateKey,
    fetch,
    reload,
    updateTableData,
    updateTableDataRecord,
    deleteTableDataRecord,
    insertTableDataRecord,
    findTableDataRecord,
    handleTableChange
  }
}
